Help with the drop of capacitor during negative input voltage

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darva

Joined Oct 30, 2020
10
Hi all,
I am a rookie in circuit design. Could anyone help me with the drop in output during hold? It is observed when the sampled input is a negative voltage.
 

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dl324

Joined Mar 30, 2015
13,264
The LM308 symbol is pretty useless without pin numbers. Which capacitor has the voltage drop? What is U1?
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I don't see parameters for the input signal and can barely read the labels for V2 and V3. Are you using +/- 15V supplies? Looks like it could be 15 or 16.
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